Adjustable coil-winding core



m k@ n%mw -w. g wuhmw.. W F v m pm x V a R m Q Aw Q .flwllolq m cll W. & f.. ...ww w W II o l ||:|-||l|| wm wl lim J W WARD ADJUSTABLE COIL-WINDING CORE Filed Sept. 14, 1954.

Oct. 15, 1957 United btates ADJUSTABLE con-wmnmo CORE John W. Ward, Fort Smith, Ark.

Application September 14, 1954, Serial No. 455,962

1 Claim. (Cl. 140-922) This invention relates to cores or mandrels such as used for winding wire and other products, and in particular, a core for winding electro-magnetic coils in which the cross section area thereof is adjustable so that the core may readily be set to wind coils of different sizes.

The purpose of this invention is to provide an adjustable frame adapted to be used as a core for winding coils for electro-magnets and the like in which both ends of the frame are adjusted simultaneously and with the same movement wherein the size is constant throughout the length thereof.

Mandrels, spools, drums and other devices have been provided with collapsible cores or with cylindrical walls thereof adjustable to different diameters, however, with such devices, it is diflicult to adjust both ends at the same time and, consequently, it is diflicult to form coils in which the diameter is constant throughout the length thereof.

With this thought in mind, this invention contemplates a frame formed with parallel longitudinally disposed bars in which the bars are mounted with toggle-acting links on a righ and left-hand threaded shaft, whereby both ends of the bars are accurately adjusted to equal dimen- 510118.

The object of this invention is, therefore, to provide means for mounting parallel bars on a threaded shaft, whereby the bars are expanded and contracted simultaneously and with the cross sectional area of the device remaining constant throughout the length thereof.

Another object of the invention is to provide a collapsible or adjustable core for Winding electro-nagnet coils in which the device is adapted to be collapsed to facilitate removing coils therefrom.

A further object of the invention is to provide an adjustable coil-winding core in which the cross sectional area remains constant throughout the length thereof in the different positions and in which the core is of a simple and economical construction.

With these and other objects and advantages in view, the invention embodies an elongated threaded shaft having sets of rightand left-hand threads on both sides of a point midway of the length thereof with parallel bars mounted by links on pairs of hubs with the hubs positioned to straddle meeting ends of rightand left-hand threads on opposite sides of the center of the shaft for expanding and contracting said parallel bars in planes extended through the axis of the shaft, and in which similar means is provided for expanding and contracting the said parallel bars in planes parallel to and spaced from the shaft.

Other features and advantages of the invention will appear from the following description taken in connection with the drawing, wherein:

Figure l is an end elevational View showing the adjustable coil-winding core with the parts in extended positions.

2,809,674 Patented Oct. 15, 1957 Figure 2 is a longitudinal section through the core taken on line 2-2 of Figure 1.

Figure 3 is a view looking upwardly toward the lower side of the core.

Referring now to the drawing, wherein like reference characters denote corresponding parts, the improved adjustable coil-winding core of this invention includes a threaded shaft 10, pairs of hubs 11 and 12, and 13 and 14 positioned on rightand left-hand threaded sections 15 and 15, respectively, at one end, hubs 17 and 18 and 19 and 20 mounted on rightand left-hand threaded sections 21 and 22, respectively, at the opposite end, substantially L-shaped bars 23 and 24 at one side and 25 and 2.6 at the opposite side connected with toggle-acting links to the hubs and also connected with similar links to hubs on screws 27 and 28 on opposite sides of the core.

The threaded shaft 16 is divided into sections with right-hand threads 16 extended from a center point 29 to a shoulder and with the left-hand threads 15 extended from the shoulder 34) to an end 31 forming one end of the shaft. The opposite end of the shaft is provided with a section 21 having left-hand threads extended from the center point 29 to a shoulder 32 and also with the section 22 having right-hand threads extended fiom the shoulder 32 to an end 33. The ends of the shaft are provided with blocks 34 and 35, respectively, the blocks being provided with flat sides and being center drilled to provide center-point recesses 35 and 37 to facilitate retaining the shaft in a .lathe such as with one block held in a chuck in the head stock and the other on the center of the tail stock.

Lock nuts 33 and 3? are provided on the end sections 15 and 22 of the shaft for securing the hubs 11 and 18 in adjusted positions whereby the parts are adapted to be adjusted to form a coil of a predetermined size and after being adjusted to the size desired the parts are locked in the adjusted positions with the lock nuts.

The hubs 11 and 12 are provided with downwardly disposed flanges 4G and 41 to which links 42 and 43 are pivotally connected with pins 44 and 45, respectively, and the lower ends of the links are connected with a pin 46 to an upwardly extended flange 47 of the L-shaped bar 25. The hubs 11 and 12 are also provided with upwardly extended flanges 48 and 49 to which links 50 and 51 are pivotally connected with pins 52 and 53, respectively, and, as shown in Figure 1, the upper ends of the links 50 and 51 are connected to a flange 54 of the bar 24 with a pin 55.

The hubs 13 and 14, being similar to the hubs 11 and 12, are also provided with upwardly extended flanges, as indicated by the numeral 56, and lower or downwardly extended flanges 57 with links 58 and 59 being connected to the flanges 56 with pins 69 and to a flange 61 of the bar 23 with a pin e2. The flanges 57 of the hubs 13 and 14- are similarly connected with links 63 and 64 to a flange extended from the bar 26 with the links connected to the flange 65 with a pin 66 and to the flanges 57 with pins 67.

The hubs 17 and 18 are connected, in a similar manner, With links 68 and 69 to the flange 47 and with links '79 and 71 to the flange 54; and the hubs 19 and 20 are conecte with links 72 and 73 to the flange 61 and with similar links 74 and '75 to the flange 65. By this means, rotation of the threaded shaft 19 spreads and contracts the hubs whereby the links connecting the hubs to the L-shaped bars at the corners are spread to reduce the size of the core and contracted to increase the size of the core.

In this movement, the bars 23, 24, 25 and 26 are extended and contracted laterally and in order to provide supporting means for the bars the bars are connected to the screws 27 and 28 with links and hubs, similar to the links and hubs connecting the bars to the shaft 10 and,

of the core also connected to the bars 23 and in addition, the links are connected to the bars with hinges.

As illustrtaed in Figure 2, the screw 27 isformed with a section 76 having right-hand threads and a section 77 with left-hand threads, atone end, and the opposite end is provided with a similar "section 78 having left-hand threads and a section 79 having right-handthreads In the same manner, the screw 28 is provided with a section 80 having right-hand threads and a section 81 hav ing left-hand-threads and, at the opposite end, with a section 82 having left-hand threads and a section 83 having right-hand threads,

Hubs 84 and'85, positioned on the sections 81 and 80 of the screw 28, are connected to' the bar 25 .with links 86 and 87 and to the bar 26 with links 88 and 89 and similar" hubs 90 and'9i on the sections 82 and83, respectively, are connected to the bar 25 with links 92 and 93 and to the bar 26 with similar links 94 and 95.

The screw 27 is provided with rightand left-hand threaded sections, similar to the screw 28, and hubs 96 and 97 at one end are connected with links 98 and 99 to'the bars 23 and 24, respectively, with similar hubs 109 and 101 on the end of the screw 27 at the opposite end I 24 with links similar to the links 98 and 99.

The links 93 and 99, at both ends of the core, and also the links connecting the hubs 84, 85, 9t) and 91 to the bars 25 and 26 at the opposite side are connected to the knobs 104 and 105 and similar knobs 106 and 107 are provided on the ends of the screw 28. By this means, r

the links connecting the bars 23 and 24 at one side and 25 and 26 at the other, may readily be actuated by hand to compensate for movements of'the links connecting the bars to the shaft 10.

Withthe parts assembled in this maner, the blocks or knobs 34 and 35 on the ends of the shaft 10 maybe positioned in a chuck of a head stock and on a center of a a tail stock and with the L-shaped bars set to a predetermined size wire for a coil may be wrapped over the bars and after the coil is formed the bars may be collapsed to permit removal of the coil from the core.

It will be understood that although the core is described asbeing particularly adapted for Wire for magnetic coils strips of material, bars or rods may be wrapped thereon and coils formed on the core may be used for other purposes. a

It will be understood that modifications, within the scope of the appended claim, may be made in the design and arrangement of the parts without departing from the spirit of the invention.

What is claimed is:

A coil-winding core comprising a shaft having rightand' left-hand threaded sections at each end, internally threaded hubs mounted on the sections of, the shaft, upwardly'and downwardly disposed flanges on said hubs extending from said hubs in opposite directions and in parallel planes, parallel bars spaced from the shaft, links connecting the-parallel bars to the ends of the flanges on the hubs on the shaft whereby rotation of the shaft in one direction moves the bars awayfrom the shaft and rotation of the shaft in the opposite direction draws the bars toward the shaft, screws having rightand left-hand threads thereon positioned between the bars on opposite sides of the shaft, hubs threaded on said screws and links connecting the hubs on the screws to adjacent parallel bars, said shaft having blocks with center recesses therein on ends thereof, said screws having knurled knobs on the ends, and hinges in the connections of the links of the screws to the parallel bars. 7

References Cited in the file of this patent UNITED STATES PATENTS 811,357 Azary Jan. 30, 1906 1,220,974 Gebhart Mar. 27, 1917 1,260,786 Manz Mar. 26, 1918 1,532,187 Koppraasch Apr. 7, 1925 1,620,879 Fathauer Mar. 15, 1927 1,895,427 Steurer Ian. 24, 1933 

